BENTLY NEVADA 3500/25-01-01-00 (149369-01 + 125800-01) Enhanced Keyphasor Module

Description

The 3500/25 Enhanced Keyphasor Module is a half-height, two-channel module designed for use in a 3500 Machinery Protection System. It receives input signals from proximity probes or magnetic pickups, converting them into digital Keyphasor signals. These signals indicate when the Keyphasor mark on a rotating shaft coincides with the Keyphasor transducer, providing crucial rotational speed data. The module can handle up to four Keyphasor signals in a standard configuration or up to eight in a paired configuration.

Specifications

Power Consumption:

• 3.2 Watts (typical)

Signal Inputs:

• The module accepts up to two transducer signals per channel, from proximity probes or magnetic pickups.
• Input range for Non-Isolated I/O modules: +0.8 V to -21.0 V
• Input range for Isolated I/O modules: +5V to -11V
• Passive magnetic pickups require a minimum shaft speed of 200 rpm (3.3 Hz).

Input Impedance:

• 21.8 kΩ (minimum)

Signal Conditioning:

• Speed/Frequency Signal Ranges: 1 to 1,200,000 cpm (0.017 to 20 kHz), supporting multiple events per revolution up to 20 kHz.
• Output range: 1 to 99,999 cpm (0.017 to 1667 Hz)
• Accuracy (at +25°C / +77°F):
  • Non-processed signals:
    • 0.017 to 100 Hz: ±1 cpm
    • 101 to 500 Hz: ±8 cpm
    • 501 to 20 kHz: ±1% of cpm
  • Processed signals:
    • 0.017 to 60 Hz: ±1 cpm
    • 61 to 150 Hz: ±8 cpm
    • 151 to 20 kHz: ±1% of cpm

Transducer Conditioning:

• Auto Threshold: Minimum 2 V peak-to-peak amplitude for triggering, with a minimum frequency of 120 rpm (2 Hz).
• Manual Threshold: User-selectable from 0 to -20 V DC, with a minimum signal amplitude of 500 mV peak-to-peak.
• Hysteresis: Adjustable from 0.2 to 2.5 Volts.

Outputs:

• Two buffered Keyphasor outputs at the front via coaxial connectors, and two more outputs at the back via Euro-style connectors.
• Output Impedance: 504 Ω maximum for buffered output.

Keyphasor Transducer Power Supply:

• -24 V DC, 40 mA maximum per channel.

Ordering Information

Model Number: 3500/25-02-01-01 (or variations depending on specifications)

Key Features to Specify:

1. A – Number of Channels:
   • 0 2: Two half-height 2-channel Keyphasor cards (order for 4 channels).
2. B – Type of I/O Module:
   • 0 1: I/O module with Internal Terminations.
3. C – Agency Approval Option:
   • 0 0: Not required.

Spares

• 149369-01: Enhanced Keyphasor Module (can replace 125792-01 Keyphasor Module).
• 125800-01: Keyphasor I/O Module with Internal Terminations.

Ordering Considerations

• External termination blocks cannot be used with internal termination I/O modules.
• When using external terminations, the external blocks and cables must be ordered separately.
• For more advanced signal processing functions, consulting a Bently Nevada sales representative is recommended.

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